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问题 单项选择题

某工程已经监理工程师批准的双代号网络计划如下图所示(单位：月)。

该工程施工中，G工作因材料供应问题，未能及时开工将造成总工期延误1个月，为保证工期，施工单位决定压缩相关工作持续时间，已知压缩D，E，G，H工作将相应分别增加费用1万元、2万元、3万元、4万元。

根据材料，回答以下问题：

该工程关键线路是（）。

A．①→②→④→⑥→⑧

B．①→②→⑤→⑥→⑧

C．①→②→⑤→⑦→⑧

D．①→③→⑦→⑧

答案

参考答案：C

解析：

本题考核的是1Z203033工程网络计划有关时间参数的计算。自始至终全部由关键工作组成的线路为关键线路，或线路上总的工作时间最长的线路为关键线路。关键线路为①→②→⑤→⑦→⑧。

填空题

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .

Tragedies have a way of making people rethink their (1) and find a new focus. They make people think about what a society needs in order to (2) . The notion of doing something to take control of society or of our fate as humans might be dated back to ancient times of the (3) . Now, in the early 21st century, " social (4) " are trying to take back some (5) over society’s direction once again. A social inventor is not necessarily a social (6) , a social (7) or someone who works in a (8) industry or invents new (9) and consumer products. A social inventor is using the power of (10) thinking, to come up with ideas for (11) in certain communities or sections of society. They have a vision of a (12) world and create new systems or practices. Their ideas may seem (13) or impossible. They are usually quite (14) people. But some of these creative thinkers have (15) and quietly changed the way we live. Social inventions do not have to be (16) . Sometimes they are new (17) for neighborhoods or communities, or even very (18) ideas. The idea of social inventions has become so popular in recent years. It shows how much people desire to make a (19) in our society and not remain (20) .
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单项选择题

过电压继电器的返回系数总是（），返回子数越接近于，则说明继电器灵敏度高。

A、大于1

B、等于1

C、小于1
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